Report - Entomological Society of Ontario Volume 36-40

Report - Entomological Society of Ontario Volume 36-40

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...were about three weeks later. There are said to be two broods each year, the females of the last brood laying their eggs late in the autumn. The scale, as mentioned above. confines its attack solely to conifers. We have found it at Guelph on the following pines: White, Bull, Austrian, Scotch, Jack, and Dwarf Mugho, and also on the Norway and White Spruce. Remedies.--As a rule, there is no need of resorting to any remedy to control this scale as it is seldom sufliciently abundant to do much damage. If, however, it should be found in such numbers as to injure perceptibly trees in a lawn, kerosene emulsion can be used, but this would be impracticable, of course, in any place where there were a very large number of trees to treat. Parasites.---About one-third of the scales examined this year were found to have been parasitised, apparently by a Chalcid fly. A species of mite was also found preying upon them. Thus it is probable that we owe much of our security against the rapid increase of this insect to these parasites. THE LIME'-SULPHUR WASH. BY L. Caassn, ONTARIO AGRICULTURAL COLLEGE, GUELPH. From time to time during the last two years questions have arisen in connection with the lime-sulphur wash which_ have made the Entomological department feel that there was need of a further study of this important mixture in order that they might be able to give fuller and more definite information to fruit-growers. Accordingly Dr. Bethune and Mr. Jarvis, not having an opportunity themselves to devote their attention to this subject on account of the mass of other work to which they have to give their time and energy, asked me to begin the investigation this year. After reading the best literature I could find oh the subject and getting valuable...show more

Product details

  • Paperback | 344 pages
  • 189 x 246 x 18mm | 617g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236839285
  • 9781236839282